I thought it was one of the saddest part of the episode last night that he couldn't say a proper goodbye to donna and rose, donna was his best friend, rose the love of his life and he couldn't tell them who he was and neither knew what was about to happen to him, i also thought it was brilliant though that he gave donna the lottery ticket and gave her a chance to change her life something that she said she wanted to do when she first met him. he couldn't give Rose anything though just the promise that she will have a brilliant year which of course she did. It also felt very final and it will probably be the last time we see them in the show, both were brilliant characters and companions to the doctor so it was fitting they both played a part in David Tennant's final episode.